include/asm-ppc64/eeh.h

   1 /*
   2  * eeh.h
   3  * Copyright (C) 2001  Dave Engebretsen & Todd Inglett IBM Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  18  */
  19
  20 #ifndef _PPC64_EEH_H
  21 #define _PPC64_EEH_H
  22
  23 #include <linux/config.h>
  24 #include <linux/init.h>
  25 #include <linux/list.h>
  26 #include <linux/string.h>
  27
  28 struct pci_dev;
  29 struct device_node;
  30 struct device_node;
  31 struct notifier_block;
  32
  33 #ifdef CONFIG_EEH
  34
  35 /* Values for eeh_mode bits in device_node */
  36 #define EEH_MODE_SUPPORTED      (1<<0)
  37 #define EEH_MODE_NOCHECK        (1<<1)
  38 #define EEH_MODE_ISOLATED       (1<<2)
  39
  40 void __init eeh_init(void);
  41 unsigned long eeh_check_failure(const volatile void __iomem *token,
  42                                 unsigned long val);
  43 int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev);
  44 void __init pci_addr_cache_build(void);
  45
  46 /**
  47  * eeh_add_device_early
  48  * eeh_add_device_late
  49  *
  50  * Perform eeh initialization for devices added after boot.
  51  * Call eeh_add_device_early before doing any i/o to the
  52  * device (including config space i/o).  Call eeh_add_device_late
  53  * to finish the eeh setup for this device.
  54  */
  55 void eeh_add_device_early(struct device_node *);
  56 void eeh_add_device_late(struct pci_dev *);
  57
  58 /**
  59  * eeh_remove_device - undo EEH setup for the indicated pci device
  60  * @dev: pci device to be removed
  61  *
  62  * This routine should be when a device is removed from a running
  63  * system (e.g. by hotplug or dlpar).
  64  */
  65 void eeh_remove_device(struct pci_dev *);
  66
  67 #define EEH_DISABLE             0
  68 #define EEH_ENABLE              1
  69 #define EEH_RELEASE_LOADSTORE   2
  70 #define EEH_RELEASE_DMA         3
  71
  72 /**
  73  * Notifier event flags.
  74  */
  75 #define EEH_NOTIFY_FREEZE  1
  76
  77 /** EEH event -- structure holding pci slot data that describes
  78  *  a change in the isolation status of a PCI slot.  A pointer
  79  *  to this struct is passed as the data pointer in a notify callback.
  80  */
  81 struct eeh_event {
  82         struct list_head     list;
  83         struct pci_dev       *dev;
  84         struct device_node   *dn;
  85         int                  reset_state;
  86 };
  87
  88 /** Register to find out about EEH events. */
  89 int eeh_register_notifier(struct notifier_block *nb);
  90 int eeh_unregister_notifier(struct notifier_block *nb);
  91
  92 /**
  93  * EEH_POSSIBLE_ERROR() -- test for possible MMIO failure.
  94  *
  95  * If this macro yields TRUE, the caller relays to eeh_check_failure()
  96  * which does further tests out of line.
  97  */
  98 #define EEH_POSSIBLE_ERROR(val, type)   ((val) == (type)~0)
  99
 100 /*
 101  * Reads from a device which has been isolated by EEH will return
 102  * all 1s.  This macro gives an all-1s value of the given size (in
 103  * bytes: 1, 2, or 4) for comparing with the result of a read.
 104  */
 105 #define EEH_IO_ERROR_VALUE(size)        (~0U >> ((4 - (size)) * 8))
 106
 107 #else /* !CONFIG_EEH */
 108 static inline void eeh_init(void) { }
 109
 110 static inline unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned long val)
 111 {
 112         return val;
 113 }
 114
 115 static inline int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
 116 {
 117         return 0;
 118 }
 119
 120 static inline void pci_addr_cache_build(void) { }
 121
 122 static inline void eeh_add_device_early(struct device_node *dn) { }
 123
 124 static inline void eeh_add_device_late(struct pci_dev *dev) { }
 125
 126 static inline void eeh_remove_device(struct pci_dev *dev) { }
 127
 128 #define EEH_POSSIBLE_ERROR(val, type) (0)
 129 #define EEH_IO_ERROR_VALUE(size) (-1UL)
 130 #endif /* CONFIG_EEH */
 131
 132 /*
 133  * MMIO read/write operations with EEH support.
 134  */
 135 static inline u8 eeh_readb(const volatile void __iomem *addr)
 136 {
 137         u8 val = in_8(addr);
 138         if (EEH_POSSIBLE_ERROR(val, u8))
 139                 return eeh_check_failure(addr, val);
 140         return val;
 141 }
 142 static inline void eeh_writeb(u8 val, volatile void __iomem *addr)
 143 {
 144         out_8(addr, val);
 145 }
 146
 147 static inline u16 eeh_readw(const volatile void __iomem *addr)
 148 {
 149         u16 val = in_le16(addr);
 150         if (EEH_POSSIBLE_ERROR(val, u16))
 151                 return eeh_check_failure(addr, val);
 152         return val;
 153 }
 154 static inline void eeh_writew(u16 val, volatile void __iomem *addr)
 155 {
 156         out_le16(addr, val);
 157 }
 158 static inline u16 eeh_raw_readw(const volatile void __iomem *addr)
 159 {
 160         u16 val = in_be16(addr);
 161         if (EEH_POSSIBLE_ERROR(val, u16))
 162                 return eeh_check_failure(addr, val);
 163         return val;
 164 }
 165 static inline void eeh_raw_writew(u16 val, volatile void __iomem *addr) {
 166         volatile u16 __iomem *vaddr = (volatile u16 __iomem *) addr;
 167         out_be16(vaddr, val);
 168 }
 169
 170 static inline u32 eeh_readl(const volatile void __iomem *addr)
 171 {
 172         u32 val = in_le32(addr);
 173         if (EEH_POSSIBLE_ERROR(val, u32))
 174                 return eeh_check_failure(addr, val);
 175         return val;
 176 }
 177 static inline void eeh_writel(u32 val, volatile void __iomem *addr)
 178 {
 179         out_le32(addr, val);
 180 }
 181 static inline u32 eeh_raw_readl(const volatile void __iomem *addr)
 182 {
 183         u32 val = in_be32(addr);
 184         if (EEH_POSSIBLE_ERROR(val, u32))
 185                 return eeh_check_failure(addr, val);
 186         return val;
 187 }
 188 static inline void eeh_raw_writel(u32 val, volatile void __iomem *addr)
 189 {
 190         out_be32(addr, val);
 191 }
 192
 193 static inline u64 eeh_readq(const volatile void __iomem *addr)
 194 {
 195         u64 val = in_le64(addr);
 196         if (EEH_POSSIBLE_ERROR(val, u64))
 197                 return eeh_check_failure(addr, val);
 198         return val;
 199 }
 200 static inline void eeh_writeq(u64 val, volatile void __iomem *addr)
 201 {
 202         out_le64(addr, val);
 203 }
 204 static inline u64 eeh_raw_readq(const volatile void __iomem *addr)
 205 {
 206         u64 val = in_be64(addr);
 207         if (EEH_POSSIBLE_ERROR(val, u64))
 208                 return eeh_check_failure(addr, val);
 209         return val;
 210 }
 211 static inline void eeh_raw_writeq(u64 val, volatile void __iomem *addr)
 212 {
 213         out_be64(addr, val);
 214 }
 215
 216 #define EEH_CHECK_ALIGN(v,a) \
 217         ((((unsigned long)(v)) & ((a) - 1)) == 0)
 218
 219 static inline void eeh_memset_io(volatile void __iomem *addr, int c,
 220                                  unsigned long n)
 221 {
 222         u32 lc = c;
 223         lc |= lc << 8;
 224         lc |= lc << 16;
 225
 226         while(n && !EEH_CHECK_ALIGN(addr, 4)) {
 227                 *((volatile u8 *)addr) = c;
 228                 addr = (void *)((unsigned long)addr + 1);
 229                 n--;
 230         }
 231         while(n >= 4) {
 232                 *((volatile u32 *)addr) = lc;
 233                 addr = (void *)((unsigned long)addr + 4);
 234                 n -= 4;
 235         }
 236         while(n) {
 237                 *((volatile u8 *)addr) = c;
 238                 addr = (void *)((unsigned long)addr + 1);
 239                 n--;
 240         }
 241         __asm__ __volatile__ ("sync" : : : "memory");
 242 }
 243 static inline void eeh_memcpy_fromio(void *dest, const volatile void __iomem *src,
 244                                      unsigned long n)
 245 {
 246         void *vsrc = (void __force *) src;
 247         void *destsave = dest;
 248         unsigned long nsave = n;
 249
 250         while(n && (!EEH_CHECK_ALIGN(vsrc, 4) || !EEH_CHECK_ALIGN(dest, 4))) {
 251                 *((u8 *)dest) = *((volatile u8 *)vsrc);
 252                 __asm__ __volatile__ ("eieio" : : : "memory");
 253                 vsrc = (void *)((unsigned long)vsrc + 1);
 254                 dest = (void *)((unsigned long)dest + 1);
 255                 n--;
 256         }
 257         while(n > 4) {
 258                 *((u32 *)dest) = *((volatile u32 *)vsrc);
 259                 __asm__ __volatile__ ("eieio" : : : "memory");
 260                 vsrc = (void *)((unsigned long)vsrc + 4);
 261                 dest = (void *)((unsigned long)dest + 4);
 262                 n -= 4;
 263         }
 264         while(n) {
 265                 *((u8 *)dest) = *((volatile u8 *)vsrc);
 266                 __asm__ __volatile__ ("eieio" : : : "memory");
 267                 vsrc = (void *)((unsigned long)vsrc + 1);
 268                 dest = (void *)((unsigned long)dest + 1);
 269                 n--;
 270         }
 271         __asm__ __volatile__ ("sync" : : : "memory");
 272
 273         /* Look for ffff's here at dest[n].  Assume that at least 4 bytes
 274          * were copied. Check all four bytes.
 275          */
 276         if ((nsave >= 4) &&
 277                 (EEH_POSSIBLE_ERROR((*((u32 *) destsave+nsave-4)), u32))) {
 278                 eeh_check_failure(src, (*((u32 *) destsave+nsave-4)));
 279         }
 280 }
 281
 282 static inline void eeh_memcpy_toio(volatile void __iomem *dest, const void *src,
 283                                    unsigned long n)
 284 {
 285         void *vdest = (void __force *) dest;
 286
 287         while(n && (!EEH_CHECK_ALIGN(vdest, 4) || !EEH_CHECK_ALIGN(src, 4))) {
 288                 *((volatile u8 *)vdest) = *((u8 *)src);
 289                 src = (void *)((unsigned long)src + 1);
 290                 vdest = (void *)((unsigned long)vdest + 1);
 291                 n--;
 292         }
 293         while(n > 4) {
 294                 *((volatile u32 *)vdest) = *((volatile u32 *)src);
 295                 src = (void *)((unsigned long)src + 4);
 296                 vdest = (void *)((unsigned long)vdest + 4);
 297                 n-=4;
 298         }
 299         while(n) {
 300                 *((volatile u8 *)vdest) = *((u8 *)src);
 301                 src = (void *)((unsigned long)src + 1);
 302                 vdest = (void *)((unsigned long)vdest + 1);
 303                 n--;
 304         }
 305         __asm__ __volatile__ ("sync" : : : "memory");
 306 }
 307
 308 #undef EEH_CHECK_ALIGN
 309
 310 static inline u8 eeh_inb(unsigned long port)
 311 {
 312         u8 val;
 313         if (!_IO_IS_VALID(port))
 314                 return ~0;
 315         val = in_8((u8 __iomem *)(port+pci_io_base));
 316         if (EEH_POSSIBLE_ERROR(val, u8))
 317                 return eeh_check_failure((void __iomem *)(port), val);
 318         return val;
 319 }
 320
 321 static inline void eeh_outb(u8 val, unsigned long port)
 322 {
 323         if (_IO_IS_VALID(port))
 324                 out_8((u8 __iomem *)(port+pci_io_base), val);
 325 }
 326
 327 static inline u16 eeh_inw(unsigned long port)
 328 {
 329         u16 val;
 330         if (!_IO_IS_VALID(port))
 331                 return ~0;
 332         val = in_le16((u16 __iomem *)(port+pci_io_base));
 333         if (EEH_POSSIBLE_ERROR(val, u16))
 334                 return eeh_check_failure((void __iomem *)(port), val);
 335         return val;
 336 }
 337
 338 static inline void eeh_outw(u16 val, unsigned long port)
 339 {
 340         if (_IO_IS_VALID(port))
 341                 out_le16((u16 __iomem *)(port+pci_io_base), val);
 342 }
 343
 344 static inline u32 eeh_inl(unsigned long port)
 345 {
 346         u32 val;
 347         if (!_IO_IS_VALID(port))
 348                 return ~0;
 349         val = in_le32((u32 __iomem *)(port+pci_io_base));
 350         if (EEH_POSSIBLE_ERROR(val, u32))
 351                 return eeh_check_failure((void __iomem *)(port), val);
 352         return val;
 353 }
 354
 355 static inline void eeh_outl(u32 val, unsigned long port)
 356 {
 357         if (_IO_IS_VALID(port))
 358                 out_le32((u32 __iomem *)(port+pci_io_base), val);
 359 }
 360
 361 /* in-string eeh macros */
 362 static inline void eeh_insb(unsigned long port, void * buf, int ns)
 363 {
 364         _insb((u8 __iomem *)(port+pci_io_base), buf, ns);
 365         if (EEH_POSSIBLE_ERROR((*(((u8*)buf)+ns-1)), u8))
 366                 eeh_check_failure((void __iomem *)(port), *(u8*)buf);
 367 }
 368
 369 static inline void eeh_insw_ns(unsigned long port, void * buf, int ns)
 370 {
 371         _insw_ns((u16 __iomem *)(port+pci_io_base), buf, ns);
 372         if (EEH_POSSIBLE_ERROR((*(((u16*)buf)+ns-1)), u16))
 373                 eeh_check_failure((void __iomem *)(port), *(u16*)buf);
 374 }
 375
 376 static inline void eeh_insl_ns(unsigned long port, void * buf, int nl)
 377 {
 378         _insl_ns((u32 __iomem *)(port+pci_io_base), buf, nl);
 379         if (EEH_POSSIBLE_ERROR((*(((u32*)buf)+nl-1)), u32))
 380                 eeh_check_failure((void __iomem *)(port), *(u32*)buf);
 381 }
 382
 383 #endif /* _PPC64_EEH_H */